Safety valve for a mold clamping system of an injection molding machine

Abstract

The utility model belongs to the technical field of safety valve, concretely relates to a safety valve for mold closing system of injection molding machine, including valve body, valve seat, valve core, screw plug, reset spring, the bottom surface of valve body has A, B two oil ports, and the left installation chamber and right installation chamber are casted and communicated in valve body mounting hole, screw plug is fixedly installed on the first convex shoulder made in valve body, and the valve core is movably assembled in the valve seat, the left installation chamber is provided with a slide valve, the slide valve includes slide valve main body and jackscrew, the jackscrew is placed in the left side end of valve core of right installation chamber through the hole of the partition plate, the other end of valve core is provided with spring seat, spring seat is in contact with screw plug through reset spring, the other end of spring seat is provided with detection rod, the outer end of screw plug is provided with sensor body, the outer end of sensor body is provided with signal processing unit, and detection rod is placed in sensor body through screw plug and moves axially for detecting the relative position of valve core. The valve core structure has the functions of opening, time delay and throttling.

Description

Technical Field

[0001] This utility model belongs to the field of safety valve technology, specifically relating to a safety valve for an injection molding machine mold closing system. Background Technology

[0002] In the hydraulic system of an injection molding machine, there is a safety valve controlling the action of the mold clamping cylinder. This safety valve ensures that the action of the mold clamping cylinder does not occur simultaneously with the action of other cylinders. Precise opening and closing of the safety valve is necessary to accurately control the movement of the mold clamping cylinder and other cylinders in the injection molding machine's hydraulic system, ensuring the safe and stable operation of the hydraulic system. Summary of the Invention

[0003] To address the technical problems existing in the prior art and achieve the above-mentioned objectives, this utility model provides a safety valve for an injection molding machine mold clamping system, comprising a valve body, a valve seat, a valve core, a screw plug, and a return spring. The bottom surface of the valve body has two oil ports, A and B. A left mounting chamber and a right mounting chamber are cast and connected within the mounting hole of the valve body. Oil ports A and B are respectively connected to the right mounting chamber by casting. The screw plug fixes the valve seat to a first shoulder formed within the valve body. The valve core is movably assembled within the valve seat. A slide valve is disposed within the left mounting chamber. The slide valve includes a slide valve body and a push rod. The push rod passes through a hole in the partition plate between the left and right mounting chambers and is positioned at the left end of the valve core in the right mounting chamber. A spring seat is disposed at the other end of the valve core. The spring seat abuts against the screw plug via a return spring. A detection rod is disposed at the other end of the spring seat. A sensor body is disposed at the outer end of the screw plug. A signal processing unit is disposed at the outer end of the sensor body. The detection rod passes through the screw plug and is positioned within the sensor body, moving axially to detect the relative position of the valve core.

[0004] The left end of the valve core is provided with a first step and a second step. An oil storage tank is formed at the connection between the first step and the second step. A chamfer is provided at the connection between the oil storage tank and the second step. The chamfer and the valve seat shoulder form an oil sealing port to isolate the oil.

[0005] The slide valve divides the left mounting chamber into a rod chamber and a rodless chamber. The rodless chamber is connected to the external control port Z through a process hole 1 set at an angle upward, and the rod chamber is connected to the external leakage port Y through a process hole 2 set at an angle upward.

[0006] The right mounting chamber is divided into a first working chamber and a second working chamber. The valve core near the screw plug forms a third working chamber with the screw plug. The B oil port is connected to the second working chamber and is connected to the third working chamber through the X port via the through hole opened on the screw plug.

[0007] A transition joint is provided between the sensor body and the screw plug, and a hole is provided in the middle of the transition joint for the probe rod to pass through.

[0008] This utility model has the following features and beneficial effects: The safety valve is equipped with a displacement sensing switch. When the valve core is closed, the sensor body on the safety valve detects the position of the probe rod and sends a signal through the signal processing unit, allowing other actuating cylinders to operate. When the valve core is open, the sensor body detects the position of the probe rod and sends a signal through the signal processing unit, ensuring that all other actuating cylinders stop working. The valve core structure has functions such as opening, delay, and throttling. A position detection device is added to the rear end of the valve core, providing position detection functionality and transmitting position signals. The oil reservoir stores hydraulic oil during valve core movement, reducing friction and wear; the chamfered surface achieves progressive sealing, reducing opening and closing impact and extending seal life.

[0009] By redesigning the valve core of the hydraulic control check valve and adding a position detection function, the system's safety and control precision are improved by ensuring that the actions of the mold clamping cylinder and other cylinders do not occur simultaneously. These improvements not only enhance the performance of the safety valve but also strengthen its application in injection molding machine mold clamping systems. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 This is the front view of the present utility model;

[0012] Figure 3 for Figure 3 Sectional view at CC;

[0013] Figure 4 This is the front view of the present utility model;

[0014] Figure 5 for Figure 4 Sectional view at point DD;

[0015] Figure 6 This is a schematic diagram of the valve body structure of this utility model;

[0016] Figure 7 This is a front view of the valve body of this utility model;

[0017] Figure 8 for Figure 7 Sectional view at EE;

[0018] Figure 9 This is a schematic diagram of the valve core structure of this utility model;

[0019] Figure 10 This is a schematic diagram of the safety valve of this utility model and a schematic diagram of its application scenarios.

[0020] In the diagram: 1-Valve body; 10-Divider plate; 101 Process hole one; 102-Process hole two; 11-Left mounting chamber; 111-Rod chamber; 112-Rodless chamber; 12-Right mounting chamber; 121-First working chamber; 122-Second working chamber; 123-Third working chamber; 13-First shoulder; 2-Valve seat; 20-Valve seat shoulder; 3-Valve core; 31-First step; 32-Second step; 33-Oil reservoir; 34-Beveled chamfer; 4-Plug; 41-Through hole; 5-Reset spring; 6-Slide valve; 61-Slide valve body; 62-Push rod; 7-Spring seat; 71-Detector rod; 8-Sensor body; 81-Transition joint; 9-Signal processing unit. Detailed Implementation

[0021] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0022] like Figure 1-10 As shown, a safety valve for an injection molding machine mold clamping system includes a valve body 1, a valve seat 2, a valve core 3, a screw plug 4, and a return spring 5. The bottom surface of the valve body 1 has two oil ports, A and B. A left mounting chamber 11 and a right mounting chamber 12 are cast and connected in the mounting hole of the valve body 1. The two oil ports A and B are respectively connected to the right mounting chamber 12 by casting. The screw plug 4 fixes the valve seat 2 on the first shoulder 13 made in the valve body 1 and divides the right mounting chamber 12 into a first working chamber 121 and a second working chamber 122. The valve core near the screw plug forms a third working chamber 123 with the screw plug. The oil port B is connected to the second working chamber 122 and is connected to the third working chamber through the X port and the through hole 41 opened on the screw plug. The valve core 3 is movably mounted in the valve seat 2. The movement of the valve core 3 in the valve seat 2 controls the flow of oil to and from ports A and B. A slide valve 6 is provided in the left installation chamber. The slide valve includes a slide valve body 61 and a connecting rod 62. The connecting rod 62 passes through a hole in the partition plate 10 between the left and right installation chambers and is placed at the left end of the valve core 3 in the right installation chamber 12. A spring seat 7 is provided at the other end of the valve core. The spring seat abuts against the screw plug 4 through a return spring. A probe rod 71 is provided at the other end of the spring seat 7. A sensor body 8 is provided at the outer end of the screw plug 4. A signal processing unit 9 is provided at the outer end of the sensor body 8. The probe rod 71 passes through the screw plug 4 and is placed in the sensor body 8 to move axially to detect the relative position of the valve core.

[0023] like Figure 3 , 9As shown, the left end of the valve core is provided with a first stepped portion 31 and a second stepped portion 32. An oil reservoir 33 is formed at the connection between the first stepped portion 31 and the second stepped portion 32. A chamfered edge 34 is provided at the connection between the oil reservoir 33 and the second stepped portion. The chamfered edge 34 forms an oil sealing port with the valve seat shoulder 20 to isolate the oil. The oil reservoir 33 stores hydraulic oil when the valve core moves, reducing friction and wear; the chamfered edge 34 achieves progressive sealing, reduces opening and closing impact, and extends the seal life.

[0024] The slide valve 6 divides the left mounting chamber 11 into a rod-type chamber 111 and a rodless chamber 112. The rodless chamber 111 is connected to the external control port Z through an upwardly angled process hole 101, while the rod-type chamber 112 is connected to the external discharge port Y through an upwardly angled process hole 102. High-pressure oil from the external control port Z controls the slide valve and the push rod to move the valve core 3 axially, further pushing the probe rod 71 axially, thereby achieving its function of sensing electrical signals.

[0025] like Figure 5 As shown, a transition joint 81 is provided between the sensor body 8 and the screw plug 4. The transition joint 81 has a hole in the middle for the probe rod 71 to pass through. The transition joint protects the sensor from oil contamination and extends its service life.

[0026] When the valve core is closed, the sensor on the safety valve detects the position of the probe rod and sends a signal through the signal processing unit, allowing other hydraulic cylinders to operate. When the valve core is open, the sensor detects the position of the probe rod and sends a signal through the signal processing unit, ensuring that all other hydraulic cylinders stop working. This ensures the mold closing system operates safely and prevents equipment damage due to misoperation.

[0027] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A safety valve for an injection molding machine mold clamping system, comprising a valve body (1), a valve seat (2), a valve core (3), a screw plug (4), and a return spring (5), wherein the bottom surface of the valve body (1) has two oil ports, A and B, and a left mounting chamber (11) and a right mounting chamber (12) are cast and connected within the mounting hole of the valve body (1), and the two oil ports A and B are respectively connected to the right mounting chamber (12) by casting, characterized in that, The plug (4) fixes the valve seat (2) on the first shoulder (13) made inside the valve body (1). The valve core (3) is movably assembled inside the valve seat (2). A slide valve (6) is provided in the left installation chamber. The slide valve includes a slide valve body (61) and a push rod (62). The push rod (62) passes through the hole opened on the partition plate (10) between the left and right installation chambers and is placed at the left end of the valve core (3) in the right installation chamber (12). A spring seat (7) is provided at the other end of the valve core. The spring seat abuts against the plug (4) through a return spring. A probe rod (71) is provided at the other end of the spring seat (7). A sensor body (8) is provided at the outer end of the plug (4). A signal processing unit (9) is provided at the outer end of the sensor body (8). The probe rod (71) passes through the plug (4) and is placed in the sensor body (8) to move axially to detect the relative position of the valve core.

2. The safety valve for an injection molding machine mold clamping system according to claim 1, characterized in that, The valve core (3) has a first step (31) and a second step (32) at its left end. An oil storage tank (33) is formed at the connection between the first step (31) and the second step (32). A chamfer (34) is provided at the connection between the oil storage tank (33) and the second step. The chamfer (34) forms an oil sealing port with the valve seat shoulder (20) to isolate the oil.

3. A safety valve for an injection molding machine mold clamping system according to claim 2, characterized in that, The slide valve (6) divides the left installation chamber (11) into a rod chamber (111) and a rodless chamber (112). The rodless chamber (111) is connected to the external control port Z through a process hole (101) set at an angle upward, and the rod chamber (112) is connected to the external discharge port Y through a process hole (102) set at an angle upward.

4. A safety valve for an injection molding machine mold clamping system according to claim 3, characterized in that, The right installation chamber (12) is divided into a first working chamber (121) and a second working chamber (122). The valve core near the screw plug forms a third working chamber (123) with the screw plug. The B oil port is connected to the second working chamber (122) and is connected to the third working chamber (123) through the X port via the through hole (41) opened on the screw plug.

5. A safety valve for an injection molding machine mold clamping system according to claim 4, characterized in that, A transition joint (81) is provided between the sensor body (8) and the screw plug (4), and a hole is provided in the middle of the transition joint for the probe rod (71) to pass through.

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